US4376476A - Driving circuit for magnetic clutches for use with refrigerant compressors - Google Patents
Driving circuit for magnetic clutches for use with refrigerant compressors Download PDFInfo
- Publication number
- US4376476A US4376476A US06/229,716 US22971681A US4376476A US 4376476 A US4376476 A US 4376476A US 22971681 A US22971681 A US 22971681A US 4376476 A US4376476 A US 4376476A
- Authority
- US
- United States
- Prior art keywords
- transistor
- resistance
- capacitor
- magnetic
- clutch
- Prior art date
- Legal status (The legal status is an assumption and is not a legal conclusion. Google has not performed a legal analysis and makes no representation as to the accuracy of the status listed.)
- Expired - Lifetime
Links
- 239000003507 refrigerant Substances 0.000 title claims abstract description 15
- 239000003990 capacitor Substances 0.000 claims abstract description 34
- 230000004044 response Effects 0.000 claims abstract description 10
- 230000005284 excitation Effects 0.000 claims abstract description 3
- 239000004020 conductor Substances 0.000 description 15
- 230000005540 biological transmission Effects 0.000 description 4
- 229920006395 saturated elastomer Polymers 0.000 description 4
- 230000009471 action Effects 0.000 description 3
- 238000010586 diagram Methods 0.000 description 2
- 230000009467 reduction Effects 0.000 description 2
- 239000002699 waste material Substances 0.000 description 2
- 238000004378 air conditioning Methods 0.000 description 1
- 230000006866 deterioration Effects 0.000 description 1
- 208000016253 exhaustion Diseases 0.000 description 1
- 230000004907 flux Effects 0.000 description 1
- 230000004048 modification Effects 0.000 description 1
- 238000012986 modification Methods 0.000 description 1
Images
Classifications
-
- F—MECHANICAL ENGINEERING; LIGHTING; HEATING; WEAPONS; BLASTING
- F16—ENGINEERING ELEMENTS AND UNITS; GENERAL MEASURES FOR PRODUCING AND MAINTAINING EFFECTIVE FUNCTIONING OF MACHINES OR INSTALLATIONS; THERMAL INSULATION IN GENERAL
- F16D—COUPLINGS FOR TRANSMITTING ROTATION; CLUTCHES; BRAKES
- F16D27/00—Magnetically- or electrically- actuated clutches; Control or electric circuits therefor
- F16D27/10—Magnetically- or electrically- actuated clutches; Control or electric circuits therefor with an electromagnet not rotating with a clutching member, i.e. without collecting rings
- F16D27/108—Magnetically- or electrically- actuated clutches; Control or electric circuits therefor with an electromagnet not rotating with a clutching member, i.e. without collecting rings with axially movable clutching members
- F16D27/112—Magnetically- or electrically- actuated clutches; Control or electric circuits therefor with an electromagnet not rotating with a clutching member, i.e. without collecting rings with axially movable clutching members with flat friction surfaces, e.g. discs
-
- F—MECHANICAL ENGINEERING; LIGHTING; HEATING; WEAPONS; BLASTING
- F16—ENGINEERING ELEMENTS AND UNITS; GENERAL MEASURES FOR PRODUCING AND MAINTAINING EFFECTIVE FUNCTIONING OF MACHINES OR INSTALLATIONS; THERMAL INSULATION IN GENERAL
- F16D—COUPLINGS FOR TRANSMITTING ROTATION; CLUTCHES; BRAKES
- F16D48/00—External control of clutches
- F16D48/06—Control by electric or electronic means, e.g. of fluid pressure
- F16D48/064—Control of electrically or electromagnetically actuated clutches
-
- F—MECHANICAL ENGINEERING; LIGHTING; HEATING; WEAPONS; BLASTING
- F16—ENGINEERING ELEMENTS AND UNITS; GENERAL MEASURES FOR PRODUCING AND MAINTAINING EFFECTIVE FUNCTIONING OF MACHINES OR INSTALLATIONS; THERMAL INSULATION IN GENERAL
- F16D—COUPLINGS FOR TRANSMITTING ROTATION; CLUTCHES; BRAKES
- F16D27/00—Magnetically- or electrically- actuated clutches; Control or electric circuits therefor
- F16D2027/002—Electric or electronic circuits relating to actuation of electromagnetic clutches
-
- F—MECHANICAL ENGINEERING; LIGHTING; HEATING; WEAPONS; BLASTING
- F16—ENGINEERING ELEMENTS AND UNITS; GENERAL MEASURES FOR PRODUCING AND MAINTAINING EFFECTIVE FUNCTIONING OF MACHINES OR INSTALLATIONS; THERMAL INSULATION IN GENERAL
- F16D—COUPLINGS FOR TRANSMITTING ROTATION; CLUTCHES; BRAKES
- F16D27/00—Magnetically- or electrically- actuated clutches; Control or electric circuits therefor
- F16D2027/008—Details relating to the magnetic circuit, or to the shape of the clutch parts to achieve a certain magnetic path
-
- F—MECHANICAL ENGINEERING; LIGHTING; HEATING; WEAPONS; BLASTING
- F16—ENGINEERING ELEMENTS AND UNITS; GENERAL MEASURES FOR PRODUCING AND MAINTAINING EFFECTIVE FUNCTIONING OF MACHINES OR INSTALLATIONS; THERMAL INSULATION IN GENERAL
- F16D—COUPLINGS FOR TRANSMITTING ROTATION; CLUTCHES; BRAKES
- F16D2500/00—External control of clutches by electric or electronic means
- F16D2500/10—System to be controlled
- F16D2500/102—Actuator
- F16D2500/1021—Electrical type
- F16D2500/1022—Electromagnet
-
- F—MECHANICAL ENGINEERING; LIGHTING; HEATING; WEAPONS; BLASTING
- F16—ENGINEERING ELEMENTS AND UNITS; GENERAL MEASURES FOR PRODUCING AND MAINTAINING EFFECTIVE FUNCTIONING OF MACHINES OR INSTALLATIONS; THERMAL INSULATION IN GENERAL
- F16D—COUPLINGS FOR TRANSMITTING ROTATION; CLUTCHES; BRAKES
- F16D2500/00—External control of clutches by electric or electronic means
- F16D2500/10—System to be controlled
- F16D2500/104—Clutch
- F16D2500/10443—Clutch type
- F16D2500/1045—Friction clutch
-
- F—MECHANICAL ENGINEERING; LIGHTING; HEATING; WEAPONS; BLASTING
- F16—ENGINEERING ELEMENTS AND UNITS; GENERAL MEASURES FOR PRODUCING AND MAINTAINING EFFECTIVE FUNCTIONING OF MACHINES OR INSTALLATIONS; THERMAL INSULATION IN GENERAL
- F16D—COUPLINGS FOR TRANSMITTING ROTATION; CLUTCHES; BRAKES
- F16D2500/00—External control of clutches by electric or electronic means
- F16D2500/70—Details about the implementation of the control system
- F16D2500/704—Output parameters from the control unit; Target parameters to be controlled
- F16D2500/70402—Actuator parameters
- F16D2500/70418—Current
-
- F—MECHANICAL ENGINEERING; LIGHTING; HEATING; WEAPONS; BLASTING
- F16—ENGINEERING ELEMENTS AND UNITS; GENERAL MEASURES FOR PRODUCING AND MAINTAINING EFFECTIVE FUNCTIONING OF MACHINES OR INSTALLATIONS; THERMAL INSULATION IN GENERAL
- F16D—COUPLINGS FOR TRANSMITTING ROTATION; CLUTCHES; BRAKES
- F16D2500/00—External control of clutches by electric or electronic means
- F16D2500/70—Details about the implementation of the control system
- F16D2500/704—Output parameters from the control unit; Target parameters to be controlled
- F16D2500/70402—Actuator parameters
- F16D2500/7042—Voltage
-
- F—MECHANICAL ENGINEERING; LIGHTING; HEATING; WEAPONS; BLASTING
- F16—ENGINEERING ELEMENTS AND UNITS; GENERAL MEASURES FOR PRODUCING AND MAINTAINING EFFECTIVE FUNCTIONING OF MACHINES OR INSTALLATIONS; THERMAL INSULATION IN GENERAL
- F16D—COUPLINGS FOR TRANSMITTING ROTATION; CLUTCHES; BRAKES
- F16D2500/00—External control of clutches by electric or electronic means
- F16D2500/70—Details about the implementation of the control system
- F16D2500/71—Actions
- F16D2500/7107—Others
- F16D2500/7109—Pulsed signal; Generating or processing pulsed signals; PWM, width modulation, frequency or amplitude modulation
Definitions
- the present invention relates to a driving circuit for a magnetic clutch which operates to couple a refrigerant compressor used in an air conditioner for automotive vehicles, to a vehicle engine to allow transmission of torque from the latter to the former.
- a refrigerant compressor which is used in an air conditioner for automotive vehicles, is generally provided with a magnetic clutch which comprises a driving member such as a pulley which engages with a driver such as a vehicle engine, through a belt or the like, a clutch plate arranged close to a side surface of the driving member and secured to the main shaft of the compressor, and a magnetic coil arranged on the other side surface of the driving member, whereby energization of the magnetic coil causes frictional engagement of the clutch plate with the driving member to allow transmission of torque produced by the driver to the main shaft of the compressor.
- a magnetic clutch which comprises a driving member such as a pulley which engages with a driver such as a vehicle engine, through a belt or the like, a clutch plate arranged close to a side surface of the driving member and secured to the main shaft of the compressor, and a magnetic coil arranged on the other side surface of the driving member, whereby energization of the magnetic coil causes frictional engagement of the clutch plate with the driving member to allow transmission of
- a driving circuit for a magnetic clutch for use with a refrigerant compressor which comprises: a starting switch connected to a power source; a series circuit comprising a resistance and a capacitor and having a predetermined time constant, said resistance and capacitor being arranged to be energized upon closing of said starting switch; a first transistor having a base thereof connected to the junction of said resistance with said capacitor, for conduction responsive to an output from said series circuit; a second transistor having a base thereof connected to said first transistor for causing energization of said magnetic coil in response to the conduction state of said first transistor; and a limiting circuit connected to said first transistor and second transistor for limiting the excitation of said magnetic coil through said second transistor in response to the conduction state of said first transistor; wherein said magnetic coil is excited to an extent sufficient to cause engagement of said magnetic clutch during charging of said capacitor of said series circuit after closing of said starting switch, and is excited to a lesser extent but sufficient to maintain the engagement of said magnetic clutch after saturation of said capacitor.
- FIG. 1 is a schematic longitudinal sectional fragmentary view of a magnetic clutch to which the invention is applicable;
- FIG. 2 is a graph showing the electromagnetic force characteristic of the magnetic coil of a conventional magnetic clutch
- FIG. 3 is a graph showing the torque transmission characteristics of a conventional magnetic clutch on and after engagement of the clutch
- FIG. 4 is a circuit diagram showing a driving circuit for magnetic clutches, according to one embodiment of the invention.
- FIG. 5 is a graph showing the operating characteristic of the circuit in FIG. 4;
- FIG. 6 is a circuit diagram showing a driving circuit for magnetic clutches, according to another embodiment of the invention.
- FIG. 7 is a graph showing the driving pulses for magnetic clutches which is obtainable by the circuit in FIG. 6.
- FIG. 1 illustrates the essential part of a magnetic clutch in general which is adapted to be mounted on a refrigerant compressor for air conditioning systems for automotive vehicles.
- Reference numeral 3 designates a stationary member which is to be fixed to a corresponding fixing portion of a refrigerant compressor, not shown.
- the stationary member 3 has a cylindrical central portion 3a through which the main shaft, not shown, of the compressor extends, which serves as a driven member.
- the magnetic clutch has a boss 7 adapted to be secured on the above main shaft and supporting a clutch plate 5.
- a pulley 1, which serves as a driving member, is supported on the cylindrical central portion 3a via a bearing 2 fitted around the outer periphery of the central portion 3a.
- the above clutch plate 5 is disposed close to a side surface of the pulley 1 which has the other side surface formed with an annular groove 1a in which a magnetic coil 4 is fitted in a manner supported by the stationary member 3.
- the boss 7 has a flange 7a formed integrally therewith, by which is supported a plate spring 6 at its end 6a by means of a rivet 9.
- the plate spring 6 has the other end 6b connected to the outer periphery of the clutch plate 5, with an elastic member 8 interposed between the flange 7a and the clutch plate 5.
- the magnitude of electric current flowing through the magnetic coil 4 is such that after engagement of the clutch its value slightly drops due to an increase in the resistance of the coil which is heated by the electric current. Accordingly, magnetomotive force or electromagnetic force is produced in the magnetic coil at a rate substantially constant with respect to time after engagement of the clutch, as shown in FIG. 2.
- the torque, which is transmitted from the pulley 1 to the boss 7, is large at the instant of engagement of the clutch, whereas it is kept at a small but substantially constant value after engagement of the clutch, as shown in FIG. 3.
- FIG. 4 illustrates a first embodiment of the invention.
- a power source 10 which comprises a battery or the like are a positive conductor 12 and a negative conductor 13 by way of a starting switch 11 which is kept in its closed position during engagement of the clutch.
- a starting switch 11 Connected between the two conductors 13, 14 is a series circuit with a predetermined time constant, which comprises a resistance 14 and a capacitor 15.
- Another series circuit comprising resistances 16, 17 and an NPN transistor 18 having its collector and emitter connected to the resistances 16, 17, respectively, and a further series circuit comprising the magnetic coil 4 of a magnetic clutch and an NPN power transistor 19 having its collector connected to the positive conductor 12 and its emitter to the magnetic coil 4, respectively, the two series circuits being arranged in parallel with each other.
- the power transistor 19 has its base connected to the collector of the transistor 18 which in turn has its base connected to the junction of the resistance 14 with the capacitor 15.
- the switch 11 is closed to cause the capacitor 15 to charge through the resistance 14.
- the base voltage of the transistor 18 is low enough to keep the transistor 18 in the nonconducting state.
- the base voltage of the power transistor 19 is high enough to keep the transistor 19 in conduction so that the magnetic coil 4 is kept in an energized state.
- the amount of current flowing through the magnetic coil 4 is determined by the value of the resistance 16.
- the resistance 16 is set at such a value that sufficiently high electromagnetic force is produced in the magnetic coil 4 upon closing the switch 11, to bring about frictional engagement of the clutch plate 5 with the pulley 1.
- the transistor 18 After the capacitor 15 has been saturated with charge, the transistor 18 has its base voltage elevated to such a level as to cause the transistor 18 to conduct. Upon conduction of the transistor 18, the base voltage of the power transistor 19 drops to a divided voltage at the junction of the resistance 16 with the resistance 17 so that the current, which is supplied to the magnetic coil 4 through the power transistor 19, is reduced and accordingly the electromagnetic force produced in the coil 4 is correspondingly reduced as indicated by the dotted line in FIG. 5.
- the above-mentioned predetermined period of time which lasts from the start of engagement of the magnetic clutch to the start of reduction of current flowing through the magnetic coil 4, ranges from 0.3 sec. to 1.0 sec., for instance, in the case of a magnetic clutch which is used in a vane compressor having a discharge rate of from 140 cc to 170 cc per revolution of the rotor.
- the switch 11 is opened, and accordingly the circuit formed of the positive conductor 12, the power transistor 19, the magnetic coil 4 and the negative conductor 13 is shut off from the power source 10 to cause the magnetic coil 4 to be deenergized. Consequently, the clutch plate 5 is detached from the pulley 1 and moves into its original position by the force of the plate spring 6, to thus release the pulley 1 from its rotative engagement with the boss 7. On this occasion, the charge on the capacitor 15 is discharged to the negative conductor 13 via the base and emitter of the transistor 18.
- FIG. 6 illustrates another embodiment of the present invention.
- a series circuit with a predetermined time constant comprising a capacitor 20 and resistances 21, 25 is connected between a positive conductor 12 and a negative conductor 13, both of which are connected to a power source 10 by way of a starting switch 11, the junction of the capacitor 20 with the resistance 21 being connected to the bae of an NPN transistor 23 by way of the resistance 25.
- the transistor 23 has its collector connected to the base of an NPN power transistor 19' by way of a resistance 22 and its emitter to the negative conductor 13, respectively.
- the power transistor 19' has its collector connected to one end of a magnetic coil 4 which has its other end connected to the negative conductor 13, its emitter to the positive conductor 12 and its base to the output terminal 24a of an oscillator 24 by way of a resistance 26, respectively.
- the oscillator 24 has its power supply terminal 24b connected to the positive conductor 12, and its ground terminal 24c to the negative conductor 13, respectively.
- the power transistor 19' turns on or off in response to output pulses from the oscillator 24 and the on and off states of the transistor 23, to cause the magnetic coil 4 to be energized or deenergized.
- reference numeral 27 designates a diode 27 which is connected in parallel to with magnetic coil 4 to protect it from being damaged by counter electromotive force which is produced in the coil 4 when it is deenergized.
- the oscillator 24 is activated to constantly produce a pulse signal So with a predetermined pulse repetition period and a predetermined pulse width, as shown in FIG. 7.
- the capacitor 20 starts to charge.
- the base voltage of the transistor 23 is high enough to hold the transistor 23 in conduction so that the base voltage of the power transistor 19' is low enough to hold the power transistor 19' in the nonconducting state, thus holding the magnetic coil 4 in an energized state. More specifically, as shown by the symbol a in FIG.
- the voltage Vc applied to the magnetic coil 4 connected to the collector of the power transistor 19' is kept high upon clutch engaging action a so that large electromagnetic force is produced in the magnetic coil 4 to bring the clutch plate 5 into frictional engagement with the pulley 1.
- the transistor 23 has its base voltage lowered to come into the nonconducting state.
- the output pulse signal So alone of the oscillator 24 is applied to the base of the power transistor 19' to cause it to conduct intermittently as shown by the symbol b in FIG. 7 so that the current flowing through the magnetic coil 4 is effectively reduced.
- electromagnetic force is produced in the magnetic coil 4 at a reduced rate, resulting in a reduction in the power consumption by the magnetic coil 4 to a minimum value required for keeping the frictional engagement of the clutch plate 5 with the pulley 1.
- the magnetic coil 4 is intermittently energized by means of the power transistor 19' which is then responsive to the output pulses So alone from the oscillator 24.
- the pulse duty factor of the output signal So should be set to about 70 percent.
Abstract
Description
Claims (5)
Applications Claiming Priority (2)
Application Number | Priority Date | Filing Date | Title |
---|---|---|---|
JP55-12548 | 1980-02-05 | ||
JP1254880A JPS55118843A (en) | 1979-03-07 | 1980-02-06 | Degassing device for projection molding machine |
Publications (1)
Publication Number | Publication Date |
---|---|
US4376476A true US4376476A (en) | 1983-03-15 |
Family
ID=11808379
Family Applications (1)
Application Number | Title | Priority Date | Filing Date |
---|---|---|---|
US06/229,716 Expired - Lifetime US4376476A (en) | 1980-02-05 | 1981-01-29 | Driving circuit for magnetic clutches for use with refrigerant compressors |
Country Status (1)
Country | Link |
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US (1) | US4376476A (en) |
Cited By (18)
Publication number | Priority date | Publication date | Assignee | Title |
---|---|---|---|---|
EP0105789A1 (en) * | 1982-09-30 | 1984-04-18 | Canadian Fram Limited | Power steering pump failsafe clutch |
US4509091A (en) * | 1984-02-17 | 1985-04-02 | Warner Electric Brake & Clutch Company | Methods and apparatus for controlling the engagement of gap-type electromagnetic couplings |
EP0154834A2 (en) * | 1984-02-17 | 1985-09-18 | Dana Corporation | Method and apparatus for controlling electromagnetic couplings |
US4563721A (en) * | 1982-10-27 | 1986-01-07 | Siemens Aktiengesellschaft | Circuit arrangement for actuating electromagnetic switchgear |
US4567975A (en) * | 1984-02-17 | 1986-02-04 | Warner Electric Brake & Clutch Co. | Apparatus and method for controlling the engagement of a gap-type electromagnetic coupling and for alleviating engagement noise |
USRE33140E (en) * | 1984-02-17 | 1990-01-02 | Dana Corporation | Methods and apparatus for controlling the engagement of gap-type electromagnetic couplings |
US5094332A (en) * | 1990-12-31 | 1992-03-10 | Dana Corporation | Digital control system for electromagnetic clutch |
US5628390A (en) * | 1995-08-14 | 1997-05-13 | Chrysler Corporation | Method for adaptively engaging a clutch for a motor |
US5784244A (en) * | 1996-09-13 | 1998-07-21 | Cooper Industries, Inc. | Current limiting circuit |
FR2798437A1 (en) * | 1999-09-09 | 2001-03-16 | Walterscheid Gmbh Gkn | CLUTCH SYSTEM FOR AGRICULTURAL EQUIPMENT |
US6226925B1 (en) * | 1995-10-23 | 2001-05-08 | Ohi Seisakusho Co., Ltd. | System for temporarily holding an automatically driven open-close structure |
US6394244B1 (en) | 1999-12-29 | 2002-05-28 | Visteon Global Technologies, Inc. | Magnetic powder clutch |
US20060249348A1 (en) * | 2005-05-04 | 2006-11-09 | Visteon Global Technologies, Inc. | Multiple-stage magnetic clutch coil |
US20080275522A1 (en) * | 2003-12-11 | 2008-11-06 | Yanting Dong | Non-captured intrinsic discrimination in cardiac pacing response classification |
US20100106362A1 (en) * | 2008-10-24 | 2010-04-29 | Gm Global Technology Operations, Inc. | A/c compressor clutch power management |
DE102010025225A1 (en) * | 2010-06-26 | 2011-12-29 | Audi Ag | Magnetic coupling control method for air conditioning apparatus utilized in motor car, involves controlling and/or adjusting energization value of coupling between specified upper and lower values in start position |
EP2573416A1 (en) * | 2011-09-26 | 2013-03-27 | Jtekt Corporation | Electromagnetic clutch |
US8968140B1 (en) * | 2014-03-07 | 2015-03-03 | Ramsey Winch Company | Electronically actuated clutch for a planetary winch |
Citations (5)
Publication number | Priority date | Publication date | Assignee | Title |
---|---|---|---|---|
CA513814A (en) * | 1955-06-14 | A. Mason James | Electromagnetic friction device and control | |
US3084310A (en) * | 1959-12-14 | 1963-04-02 | Square D Co | Control circuit |
US3116441A (en) * | 1960-02-19 | 1963-12-31 | Itt | Circuit for maintaining a load energized at decreased power following energization |
US3268045A (en) * | 1964-04-13 | 1966-08-23 | Potter Instrument Co Inc | Clutch drive circuit |
US3558997A (en) * | 1967-09-21 | 1971-01-26 | English Electric Computers Ltd | Electric control circuits for electromagnetic devices |
-
1981
- 1981-01-29 US US06/229,716 patent/US4376476A/en not_active Expired - Lifetime
Patent Citations (5)
Publication number | Priority date | Publication date | Assignee | Title |
---|---|---|---|---|
CA513814A (en) * | 1955-06-14 | A. Mason James | Electromagnetic friction device and control | |
US3084310A (en) * | 1959-12-14 | 1963-04-02 | Square D Co | Control circuit |
US3116441A (en) * | 1960-02-19 | 1963-12-31 | Itt | Circuit for maintaining a load energized at decreased power following energization |
US3268045A (en) * | 1964-04-13 | 1966-08-23 | Potter Instrument Co Inc | Clutch drive circuit |
US3558997A (en) * | 1967-09-21 | 1971-01-26 | English Electric Computers Ltd | Electric control circuits for electromagnetic devices |
Cited By (25)
Publication number | Priority date | Publication date | Assignee | Title |
---|---|---|---|---|
EP0105789A1 (en) * | 1982-09-30 | 1984-04-18 | Canadian Fram Limited | Power steering pump failsafe clutch |
US4563721A (en) * | 1982-10-27 | 1986-01-07 | Siemens Aktiengesellschaft | Circuit arrangement for actuating electromagnetic switchgear |
US4509091A (en) * | 1984-02-17 | 1985-04-02 | Warner Electric Brake & Clutch Company | Methods and apparatus for controlling the engagement of gap-type electromagnetic couplings |
EP0154834A2 (en) * | 1984-02-17 | 1985-09-18 | Dana Corporation | Method and apparatus for controlling electromagnetic couplings |
US4567975A (en) * | 1984-02-17 | 1986-02-04 | Warner Electric Brake & Clutch Co. | Apparatus and method for controlling the engagement of a gap-type electromagnetic coupling and for alleviating engagement noise |
EP0154834A3 (en) * | 1984-02-17 | 1987-05-13 | Warner Electric Brake And Clutch Company | Method and apparatus for controlling electromagnetic couplings |
USRE33140E (en) * | 1984-02-17 | 1990-01-02 | Dana Corporation | Methods and apparatus for controlling the engagement of gap-type electromagnetic couplings |
US5094332A (en) * | 1990-12-31 | 1992-03-10 | Dana Corporation | Digital control system for electromagnetic clutch |
US5628390A (en) * | 1995-08-14 | 1997-05-13 | Chrysler Corporation | Method for adaptively engaging a clutch for a motor |
US6226925B1 (en) * | 1995-10-23 | 2001-05-08 | Ohi Seisakusho Co., Ltd. | System for temporarily holding an automatically driven open-close structure |
US5784244A (en) * | 1996-09-13 | 1998-07-21 | Cooper Industries, Inc. | Current limiting circuit |
NL1015032C2 (en) * | 1999-09-09 | 2001-07-25 | Walterscheid Gmbh Gkn | Coupling assembly for agricultural implements. |
US6497620B1 (en) | 1999-09-09 | 2002-12-24 | Gkn Walterscheid Gmbh | Coupling assembly for agricultural implements |
US20030087703A1 (en) * | 1999-09-09 | 2003-05-08 | Andreas Lohmuller | Coupling assembly for agricultural implements |
FR2798437A1 (en) * | 1999-09-09 | 2001-03-16 | Walterscheid Gmbh Gkn | CLUTCH SYSTEM FOR AGRICULTURAL EQUIPMENT |
US6394244B1 (en) | 1999-12-29 | 2002-05-28 | Visteon Global Technologies, Inc. | Magnetic powder clutch |
US20080275522A1 (en) * | 2003-12-11 | 2008-11-06 | Yanting Dong | Non-captured intrinsic discrimination in cardiac pacing response classification |
US7467701B2 (en) | 2005-05-04 | 2008-12-23 | Visteon Global Technologies, Inc. | Multiple-stage magnetic clutch coil |
US20060249348A1 (en) * | 2005-05-04 | 2006-11-09 | Visteon Global Technologies, Inc. | Multiple-stage magnetic clutch coil |
US20100106362A1 (en) * | 2008-10-24 | 2010-04-29 | Gm Global Technology Operations, Inc. | A/c compressor clutch power management |
US8332098B2 (en) | 2008-10-24 | 2012-12-11 | GM Global Technology Operations LLC | A/C compressor clutch power management |
DE102009050131B4 (en) | 2008-10-24 | 2018-06-14 | GM Global Technology Operations LLC (n. d. Ges. d. Staates Delaware) | Power management of an A / C compressor clutch and HVAC system |
DE102010025225A1 (en) * | 2010-06-26 | 2011-12-29 | Audi Ag | Magnetic coupling control method for air conditioning apparatus utilized in motor car, involves controlling and/or adjusting energization value of coupling between specified upper and lower values in start position |
EP2573416A1 (en) * | 2011-09-26 | 2013-03-27 | Jtekt Corporation | Electromagnetic clutch |
US8968140B1 (en) * | 2014-03-07 | 2015-03-03 | Ramsey Winch Company | Electronically actuated clutch for a planetary winch |
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